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/*
* Copyright (C) 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/unique_fd.h>
#include "HadamardUtils.h"
#include "rebootescrow-impl/RebootEscrow.h"
namespace aidl {
namespace android {
namespace hardware {
namespace rebootescrow {
using ::android::base::unique_fd;
ndk::ScopedAStatus RebootEscrow::storeKey(const std::vector<uint8_t>& ukek) {
int rawFd = TEMP_FAILURE_RETRY(::open(devicePath_.c_str(), O_WRONLY | O_NOFOLLOW | O_CLOEXEC));
unique_fd fd(rawFd);
if (fd.get() < 0) {
LOG(WARNING) << "Could not open reboot escrow device";
return ndk::ScopedAStatus(AStatus_fromExceptionCode(EX_UNSUPPORTED_OPERATION));
}
auto encoded = hadamard::EncodeKey(ukek);
if (!::android::base::WriteFully(fd, encoded.data(), encoded.size())) {
LOG(WARNING) << "Could not write data fully to character device";
return ndk::ScopedAStatus(AStatus_fromExceptionCode(EX_UNSUPPORTED_OPERATION));
}
return ndk::ScopedAStatus::ok();
}
ndk::ScopedAStatus RebootEscrow::retrieveKey(std::vector<uint8_t>* _aidl_return) {
int rawFd = TEMP_FAILURE_RETRY(::open(devicePath_.c_str(), O_RDONLY | O_NOFOLLOW | O_CLOEXEC));
unique_fd fd(rawFd);
if (fd.get() < 0) {
LOG(WARNING) << "Could not open reboot escrow device";
return ndk::ScopedAStatus(AStatus_fromExceptionCode(EX_UNSUPPORTED_OPERATION));
}
std::vector<uint8_t> encodedBytes(hadamard::OUTPUT_SIZE_BYTES);
if (!::android::base::ReadFully(fd, &encodedBytes[0], encodedBytes.size())) {
LOG(WARNING) << "Could not read device";
return ndk::ScopedAStatus(AStatus_fromExceptionCode(EX_UNSUPPORTED_OPERATION));
}
auto keyBytes = hadamard::DecodeKey(encodedBytes);
*_aidl_return = keyBytes;
return ndk::ScopedAStatus::ok();
}
} // namespace rebootescrow
} // namespace hardware
} // namespace android
} // namespace aidl
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